Patent · US Expired

X-ray tube with variable focus

US5812632A · kind A · utility

58Cited by

4References

13Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Peter Schardt · Simmerath, DE
Erich Hell · Erlangen, DE

Key dates

Filing date	Sep 29, 1997
Grant date	Sep 22, 1998
Priority date	—
Expiry date	Sep 29, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH01J2235/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An x-ray tube has an evacuated housing in which an electron-emitting cathode is rigidly mounted and a rotating anode having an anode dish rotatable by a drive arrangement, which is struck by the electron beam, accelerated with an electrical field, for producing x-rays. An electromagnetic system for the deflection and focusing of the electron beam has a number of current-permeated coil elements. The cathode generates a rotationally-symmetrical circular beam, and the rotational axis of the anode dish is offset from and parallel to the axis of the electron beam by the average radius of the anode dish edge. The electromagnetic system generates a dipole-free quadrupole field that deforms the electron beam cross-section.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.